view holder is being changed to recycler view and iconImageView, temperatureLabel, dayLabel are not being recognize

package com.treehouse.android.stormy.adapters;

import android.content.Context;
import android.support.v7.widget.RecyclerView;
import android.view.LayoutInflater;
import android.view.View;
import android.view.ViewGroup;
import android.widget.BaseAdapter;
import android.widget.ImageView;
import android.widget.TextView;

import com.treehouse.android.stormy.R;
import com.treehouse.android.stormy.weather.Day;

/**
 * Created by charlesdirenzo on 8/1/17.
 */
//this will act as an adapter to pass information from the day object to the
public class dayAdapter extends BaseAdapter
{

    private Context mContext;
    private Day[] mDays;

    public dayAdapter(Context context, Day[] days)
    {
        mContext = context;
        mDays = days;
    }
    @Override
    public int getCount()
    {
        return mDays.length;
    }

    @Override
    public Object getItem(int position)
    {
        return mDays[position];
    }

    @Override
    public long getItemId(int position)
    {
        return 0;    //this will go unused. This can be used to tag items for easy reference.
    }

    @Override
    public View getView(int position, View convertView, ViewGroup parent)
    {
        //viewHolder pattern will help us re-use resources and memory, power, and help the list be smoother.
        //convert view is the view that we are reusing. if it is null it's new, and if not then it has data in it.
        //layout inflater is an android object that takes xml layout and turns them into views in code that we can use.
        RecyclerView.ViewHolder holder;

        if (convertView == null)
        {
            //brand new
            convertView = LayoutInflater.from(mContext).inflate(R.layout.daily_list_item,null);
            holder = new RecyclerView.ViewHolder();
            holder.iconImageView = (ImageView) convertView.findViewById(R.id.iconImageView);
            holder.temperatureLabel = (TextView) convertView.findViewById(R.id.temperatureLabel);
            holder.dayLabel = (TextView) convertView.findViewById(R.id.dayNameLabel);

            convertView.setTag(holder);
            }
            else
            {
            holder = (RecyclerView.ViewHolder) convertView.getTag();
            }

        }

        return null;
    }

    private static class ViewHolder
    {
        ImageView iconImageView;
        TextView temperatureLabel;
        TextView dayLabel;
    }
}